Composition of matter



I06. comPoslncfls, A

COATINGAOB PLASTIC.

Patented Sept. 23, 1930 UNITED STATES ,4. ayal-Q PATENT OFFICE FRANK J. BUCK, OF LIBBY, MONTANA, ASSIGNOR TO VERMICULITE & ASBESTOS COMPOSITION OF MATTER No Drawing.

This invention pertains to a composition of matter, and more particularly a composition which will resist heat, and will produce a substantial degree of fire proofing when made in the form of plaster, wall board, paint, calcimine, and in any use where high heat resisting properties will be found to be advantageous.

The composition of matter forming the substance of the present invention has for its base, the mineral known as vermiculite, which is a certain form of mica that expands by heating and turns a golden color, being very light and withstanding a very high temperature. To adapt this mineral for use, there is incorporated therewith a chemicalbinder which binds the vermiculite together into a very hard mass without destroying the golden color of the base, the resulting composition withstanding the flame of a bkiw tforch. h h d n ormin t e composition, t e roun vermiculite i passggl thrgugh a firm egree of fineness, or it may'be used in the condition in which it is removed from the furnace. For use as laster, or stucco, the heat treated vermiculite 1s round and Ecreened, or sep zg ated by 3E1 tlied e ed neness.

The r eslliltiing product is milxed witlli1 ap roximate rom l 0 to 5 0 we' t o ery finely 'roundm ged' ddlum silicate. 1e resu mg co posi 1 n ranging usua y from between six mesh to 200 mesh. For ready mixed plaster wet a binder of sodium silicate which hasb'en boiled with a small amount of (:0 er oxide is employed.

It has also been lound that a posed of 5 artsb wei htpf e atme and 1 %%rt by gve ig 56m potassfimmate w1 i o'rm a binder w m 1s s 1g1 I y ex1 e and yet wear resisting, the resulting composition being adaptable to serve as a binder for floor tile.

When the sodium silicate blIlfllglliS boiled with copper oxide, as "above mentioned, 1t hts'ben foiiiid that the presence of the said Application filed October 81, 1927. Serial No. 230,190.

oxide will prevent sweating, due to the absorption of moisture.

The various operations will be apparent to a worker skilled in this art, the steps simply being the dehydrating and comminuting of the vermiculite, a'n'd mchaiii'ciil ifi'tfi fiiiiing therewith of the required amount of binder.

It may be pointed out that a thin board with a quarter inch coating of vermiculite plaster was subjected to the flame of an oxygen welding torch for several minutes. On removing a portion of the plaster, the board was not charred, and the plaster was not injured. Many other tests for showing the high heat resisting and high heat insulating properties of this material might be mentioned.

The gelatine acid potassium chromate binder is formed by taking 5 parts of gelatine and adding thereto 1 part of acid potassium chromate.

It will be understood that it is desired to comprehend within the scope of this invention such modifications as may be found necessary to adapt it to varying conditions and uses.

I claim:

A composition of matter comprising comminuted ignited vermiculite, and a mixture of boiled sodium silicate and copper oxide. 

